JPH0516279A - Water-absorption sheet - Google Patents

Abstract

PURPOSE:To carry out preservation and thawing of cold storage food and prevent the lowering and reduction of flavor and feeling of eating of the food and retain properly its value of commodity by laminating a water-absorption film on one face or both faces of a substrate and constituting a water-absorption sheet. CONSTITUTION:A water-absorption sheet 11 is constituted by using, for example, a urethane bonding agent for the lamination of waster-absorption films 21 on, for example, one side of a substrate 31. In using the bonding agent, two respective water-absorption films 21 of two water-absorption sheets 11 are laminated in the state of being coated on the cut face of a slice A of food, and then sealed in a polyester bag 41 with a chuck. As for the water-absorption films 21, a material selected out of cellophane, polyvinyl alcohol, polyacryl acid salt and others is adopted, and its water-absorption amount is set in the range of 0.3-300 g/m<3>. As for the substrate 31, a hydrophobic polymer material or a material selected out of metals is used. The preservation and thawing of cold storage of food are carried out in a good manner by the arrangement to prevent the lowering or reduction of flavor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention absorbs moisture (drip) generated from a cut surface or the like when storing and freezing and thawing foods, particularly vegetables and fruits containing a large amount of moisture, and suppresses the generation thereof. The present invention relates to a water absorbent sheet that is effective in maintaining freshness and protecting cut surfaces.

[0002]

2. Description of the Related Art Conventionally, a water-absorbent sheet, such as raw meat, fish, fillets thereof, vegetables, fruits, cut products thereof, etc., is displayed on a store for the purpose of absorbing the drip that occurs and paper or super absorbent resin. Sheets made of such materials are used by laying them on the bottom of the tray. However, in such a conventional water-absorbent sheet, if the water-absorbent sheet is kept in contact with the cut surface or the like during storage and freeze-thawing of food, the cut surface or the like is dehydrated, and the flavor or texture is impaired, There is a drawback in that the commercial value of the food is reduced, such as a decrease in the weight.

[0003]

The problem to be solved by the present invention is that, in the conventional water-absorbent sheet, when this sheet is used by bringing it into contact with the cut surface of food, the cut surface becomes dehydrated and the flavor is improved. This is a point that the commercial value of the food is lowered, such as the deterioration of the texture and the loss of texture.

[0004]

However, the present inventors have
In order to solve the above problems, as a result of repeated studies on water-absorbent sheets composed of various materials and structures, using a water-absorbent film as a material to be brought into contact with a cut surface of food, for supporting the water-absorbent film. It has been found that a water absorbing sheet laminated on one side or both sides of a support is correct and suitable.

That is, the present invention relates to a water-absorbent sheet comprising a water-absorbent film laminated on one side or both sides of a support.

In the present invention, the water absorbent film may be made of various materials,
Cellophane, polyvinyl alcohol, polyacrylate,
Polyacrylamide, polyethylene oxide, saponified ethylene-vinyl acetate copolymer, modified cellulose,
It is preferable to use a material selected from starch graft polymer, gelatin, and glucomannan. It is preferable to use those having a thickness of 1 to 100 μm. The film made of the above material may be used alone as a water-absorbing film, but may also be used as a laminate of films made of two or more kinds of materials. Some commercially available cellophane films and polyvinyl alcohol films are moisture-proof coated, but these are not suitable for the present invention.

[0007] As the water-absorbing film is preferably used in the range that the water absorption amount is 0.3~300g / m ^2, to use a range of 1 to 100 g / m ² more preferred. When the water absorption amount is less than 0.3 g / m ² , the adhesion between the water absorbent film and the food is deteriorated, and slippage or peeling is likely to occur. On the contrary, the water absorption is 300 g / m ²
When it is larger than the above range, the water-absorbent film absorbs too much water from the food, impairing the flavor and texture of the food and reducing the amount of the food. In particular, cellophane is excellent in wet strength and is a suitable material as the outermost layer film of the laminated water absorbent film. The water absorption here is the weight when the sample was dried in a desiccator at 23 ° C. for 24 hours, W ₀ (g), and then the sample was immersed in tap water at 20 ° C. and then taken out and the surface water was wiped off. When the weight is W ₁ (g) and the surface area of the sample is S (m ² ), the value A (g
/ M ² ). A = (W ₁ −W ₀ ) / S

In the present invention, a support made of various materials can be used, but it is preferable to use a support made of a material selected from a hydrophobic polymer material and a metal. Specific examples thereof include a polyolefin film, a polyester film, a polyvinyl chloride film, a polyvinylidene chloride film, a polyamide film, a polystyrene film, a polycarbonate film, and an aluminum foil.

The support has a thickness of 3 to 10
It is usual to use one having a range of 00μ, but 5 to 3
It is preferable to use one having a range of 00 μ, and 10 to 10
It is more preferable to use one having a range of 0 μ. Thickness is 3
When it is smaller than μ, the rigidity is insufficient and it becomes substantially difficult to support the water-absorbent film. On the contrary, if the thickness is larger than 1000 μ, it is economically disadvantageous. Note that polypropylene is a particularly preferable material for the support from the viewpoint of rigidity. And such a support, from the use of the water-absorbent sheet of the present invention having a water-absorbent film laminated on one side or both sides of the support applied to a cut surface or the like of food, in protecting the cut surface or the like. , A material having a good oxygen barrier property is preferable. Specifically, the oxygen permeability is 200 cc / m ² · da.
It is preferably y · atm or less.

As a method for laminating the water-absorbent film and the support, a method which is usually carried out industrially, for example, dry lamination or extrusion coating can be applied. The adhesive for dry lamination is not particularly limited as long as it is one that is approved for food packaging materials and has sufficient adhesive force, but a polyurethane adhesive or an epoxy adhesive is used. Is preferred. Although the thickness of the adhesive is not particularly limited, it is preferably in the range of 1 to 10 μm in a dry state.

[0011]

When food is stored and frozen and thawed, if a cut surface or the like is covered with a water-absorbent film, the drip generated from the cut surface or the like is absorbed on the spot, and the drip is not It can be prevented from flowing out to the part. Further, if a water-absorbent film having an appropriate water-absorbing ability is attached, the occurrence of drip itself can be suppressed to a low level without excessively absorbing water originally possessed by food. That is, drip rate = (weight of drip that was not completely absorbed by the water absorbent film / weight of original food) × 100 (%), water absorption = (drip absorbed by the water absorbent film (Weight of original food / weight of original food) × 100 (%), and dehydration rate = drip rate + water absorption rate (%) can all be kept low, and therefore, the flavor and texture of the food are not impaired, Also, the food is not carelessly depleted.

[0012] The water-absorbent film itself becomes unsightly due to wrinkles due to softening, swelling and expansion during water absorption, and the water-absorbing film is used when the food is used after removing the water-absorbing film. Adheres to the food, it is difficult to grasp the trigger of peeling, and the workability is poor, but if the water-absorbent film is laminated on one side or both sides of the support, the shape of the water-absorbent film is maintained. , Workability is also improved.

The water-absorbent sheet of the present invention may have a water-absorbent film laminated on one side of the support, but is preferably laminated on both sides. When stacking slices of vegetables, fruits, etc., it is sufficient to interpose one water-absorbing sheet between the slices, which is economical and at the same time can prevent curling of the water-absorbing sheet due to expansion of the water-absorbing film. Because you can.

[0014]

[Examples]

Example 1 FIG. 1 is a longitudinal sectional view (partially front view) showing an example of the present invention including its usage state. The water absorbent sheet 11 is composed of a water absorbent film 21 laminated on one surface of a support 31 with a urethane adhesive. Then, the slice A of the food has two water-absorbing sheets 11, 1 with the same configuration on the cut surface.
The water-absorbent films 21 and 21 of No. 1 are stacked in a state of being adhered and sealed in a plastic bag 41 with a chuck.

In the state shown in FIG. 1, the water absorbent film 21.
Using a cellophane having a thickness of 35μ as the support 31, a PET having a thickness of 25μ as the support 31, and a tomato slice having a thickness of 6.5mm as the slice A, and a total of 10 tomato slices A sandwiched between 20 water-absorbing sheets 11 in total. When the bag 41 was sealed, rapidly frozen at −50 ° C., and then thawed in running water at 8 ° C. for 2 hours, the drip rate, the water absorption rate, the dehydration rate, and the shape of the water absorption sheet were examined. 0.5%, the water absorption rate was 5.0%, the dehydration rate was 7.5%, and the shape of the water absorption sheet was normal. The water absorption amount of the cellophane having a thickness of 35 μ used as the water absorbent film 21 is 45
It was g / m ² .

Comparative Example 1 Evaluation was made in the same manner as in Example 1 except that a cellophane simple film having a thickness of 35 μ was used as the water absorbing sheet. The drip rate was 0.7% and the water absorption rate was 4.9%. The dehydration rate was as good as 5.6%, but the shape of the water-absorbent sheet was inferior in appearance due to wrinkling due to softening and expansion due to water absorption.

Comparative Example 2 Evaluation was performed in the same manner as in Example 1 except that a commercially available water absorbing sheet (Pichit Mini, trade name, manufactured by Showa Denko KK) was used as the water absorbing sheet, and the drip rate was 0.7%. The water absorption rate was 19.3% and the dehydration rate was 2.0%, and the water content of the tomato slices was significantly lost, resulting in no commercial value.
The water absorption of Pichit mini was 1345 g / m ² .

Comparative Example 3 Tomato slices were sealed in a plastic bag without using a water-absorbent sheet and evaluated in the same manner as in Example 1. The drip rate and dehydration rate were 21.5%. The water content of the product was significantly lost, and it became of no commercial value.

Embodiment 2 FIG. 2 is a vertical sectional view (partially front view) showing another embodiment of the present invention including its usage state. The water absorbent sheet 12 comprises water absorbent films 22 and 22 laminated on both sides of a support 32 with a polyurethane adhesive. Then, the slices B, B of the food are stacked with the water-absorbent films 22, 22 of the water-absorbent sheet 12 adhered on the cut surfaces, and sealed in a plastic bag 42 with a zipper. In the case of FIG. 2, a total of 10 stages of food slices B sandwiched by a total of 11 water absorbing sheets 12 are sealed in a plastic bag 42. Also in this case, the drip rate, the water absorption rate, the dehydration rate, and the shape of the water absorption sheet were all good.

As described above, the water-absorbent sheet of the present invention has not only the function of simply absorbing the drip from the food, but also the function of suppressing the generation of the drip from the cut surface of the food during storage and freeze-thawing of the food.

[0021]

As is apparent from the above, according to the present invention described above, it is possible to prevent the flavor and texture of the food from being impaired when the food is stored and frozen and thawed, in good appearance and workability. There is an effect that the product value can be maintained by preventing the food from losing its weight.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (partially front view) showing an embodiment of the present invention including its usage state.

FIG. 2 is a vertical cross-sectional view (partially front view) showing another embodiment of the present invention including its usage state.

[Explanation of symbols]

11, 12 ... Water absorbent sheet 21, 22 ... Water absorbent film, 31, 32 ... Support, 41, 42 ...
Plastic bag, A, B ... Slice of food

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 27, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Further, as the water-absorbent film, food sly is used.
Depending on the scan of the state, but the amount of water absorption is 0.3~300g /
It is preferable to use one having a m ² range of 1 to 100 g.
It is more preferable to use one having a range of / m ² . When the water absorption amount is less than 0.3 g / m ² , the adhesion between the water absorbent film and the food is deteriorated, and slippage or peeling is likely to occur. On the other hand, if the water absorption amount is larger than 300 g / m ² , the water-absorbent film absorbs too much water from the food, impairing the flavor and texture of the food and reducing the amount of the food. In particular, cellophane is excellent in wet strength and is a suitable material as the outermost layer film of the laminated water absorbent film. The water absorption here is the weight when the sample is dried in a desiccator at 23 ° C. for 24 hours, W ₀ (g), and then the sample is sufficiently immersed in tap water at 20 ° C. and then taken out to remove surface water. The weight when wiped off is W ₁ (g), and the surface area of the sample is S
As (m ^2), is a value calculated by the following equation A (g / m ^2). A = (W ₁ −W ₀ ) / S

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

In the state shown in FIG. 1, the water absorbent film 21.
Using a cellophane having a thickness of 35μ as the support 31, a PET having a thickness of 25μ as the support 31, and a tomato slice having a thickness of 6.5mm as the slice A, and a total of 10 tomato slices A sandwiched between 20 water-absorbing sheets 11 in total. When the bag 41 was sealed, rapidly frozen at −50 ° C., and then thawed in running water at 8 ° C. for 2 hours, the drip rate, the water absorption rate, the dehydration rate, and the shape of the water absorption sheet were examined. 0.5%, the water absorption rate was 5.0%, the dehydration rate was 7.5%, and the shape of the water absorption sheet was normal. The water absorption amount of the cellophane having a thickness of 35 μ used as the water absorbent film 21 is 45
It was g / m ² . In addition, the drip rate and water absorption rate between steps
Small difference, no drip interference observed between steps
It was

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Comparative Example 2 Evaluation was performed in the same manner as in Example 1 except that a commercially available water absorbing sheet (Pichit Mini, trade name, manufactured by Showa Denko KK) was used as the water absorbing sheet, and the drip rate was 0.7%. water absorption rate is 19.3%, dehydration rate of 2 0. With 0%, the water content of the tomato slice was remarkably lost, and the product had no commercial value. The water absorption of Pichit mini was 1345 g / m ² .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Embodiment 2 FIG. 2 is a vertical sectional view (partially front view) showing another embodiment of the present invention including its usage state. The water absorbent sheet 12 comprises water absorbent films 22 and 22 laminated on both sides of a support 32 with a polyurethane adhesive. Then, the slices B, B of the food are stacked with the water-absorbent films 22, 22 of the water-absorbent sheet 12 adhered on the cut surfaces, and sealed in a plastic bag 42 with a zipper. In the case of FIG. 2, a total of 10 stages of food slices B sandwiched by a total of 11 water absorbing sheets 12 are sealed in a plastic bag 42. Also in this case, the drip rate, the water absorption rate, the dehydration rate, and the shape of the water absorption sheet were all as good as those in Example 1 .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B32B 27/28 102 6122-4F 27/30 A 8115-4F 102 8115-4F 27/34 B65D 81 / 26 H 7191-3E (72) Satoshi Murata Satoshi Murata, 321, Minami-Akada, Nishinasuno-machi, Nasu-gun, Tochigi Prefecture 1174 Yoshikawa Heights 106 (72) Inventor Takahiro Inakuma 5-221 Tayutsuka, Nishinasuno-cho, Nasu-gun, Tochigi Prefecture Corp. Suzuki No. 202

Claims (3)

[Claims] 1. A water-absorbent sheet comprising a support and a water-absorbent film laminated on one side or both sides of a support. 2. A water-absorbent film is cellophane, polyvinyl alcohol, polyacrylate, polyacrylamide,
It is made of a material selected from polyethylene oxide, a saponified product of ethylene-vinyl acetate copolymer, modified cellulose, starch graft polymer, gelatin, and glucomannan, and has a water absorption of 0.3 to 300 g / m ² . The water absorbent sheet according to claim 1, which is a product. 3. The water absorbent sheet according to claim 1, wherein the support is made of a material selected from a hydrophobic polymer material and a metal.